PMID- 22923720
OWN - NLM
STAT- MEDLINE
DCOM- 20121203
LR  - 20220317
IS  - 1527-1315 (Electronic)
IS  - 0033-8419 (Linking)
VI  - 265
IP  - 1
DP  - 2012 Oct
TI  - Reduction of metal artifacts in patients with total hip arthroplasty with 
      slice-encoding metal artifact correction and view-angle tilting MR imaging.
PG  - 204-14
AB  - PURPOSE: To compare the new "warp" sequence (slice-encoding metal artifact 
      correction [SEMAC], view-angle tilting [VAT], and increased bandwidth) for the 
      reduction of both through-plane and in-plane magnetic resonance (MR) artifacts 
      with current optimized MR sequences in patients with total hip arthroplasty 
      (THA). MATERIALS AND METHODS: The institutional review board issued a waiver for 
      this study. Forty patients with THA were prospectively included. SEMAC, VAT, and 
      increased bandwidth were applied by using the warp turbo-spin-echo sequence at 
      1.5 T. Coronal short tau inversion-recovery (STIR)-warp and transverse 
      T1-weighted warp (hereafter, T1-warp) images, as well as standard coronal STIR 
      and transverse T1-weighted sequence images optimized with high bandwidth 
      (STIR-hiBW and T1-hiBW), were acquired. Fifteen additional patients were examined 
      to compare the T1-warp and T1-hiBW sequence with an identical matrix size. Signal 
      void was quantified. Qualitative criteria (distinction of anatomic structures, 
      blurring, and noise) were assessed on a five-point scale (1, no artifacts; 5, not 
      visible due to severe artifacts) by two readers. Abnormal imaging findings were 
      recorded. Quantitative data were analyzed with a t test and qualitative data with 
      a Wilcoxon signed rank test. RESULTS: Signal void around the acetabular component 
      was smaller for STIR-warp than STIR-hiBW images (21.6 cm2 vs 42.4 cm2; P=.0001), 
      and for T1-warp than T1-hiBW images (17.6 cm2 vs 20.2 cm2; P=.0001). Anatomic 
      distinction was better on STIR-warp compared with STIR-hiBW images (1.9-2.8 vs 
      3.6-4.6; P=.0001), and on T1-warp compared with T1-hiBW images (1.3-2.8 vs 
      1.8-3.2; P<.002). Distortion, blurring, and noise were lower with warp sequences 
      than with the standard sequences (P=.0001). Almost half of the abnormal imaging 
      findings were missed on STIR-hiBW compared with STIR-warp images (55 vs 105 
      findings; P=.0001), while T1-hiBW was similar to T1-warp imaging (50 vs 55 
      findings; P=.06). CONCLUSION: STIR-warp and T1-warp sequences were significantly 
      better according to quantitative and qualitative image criteria, but a clinically 
      relevant artifact reduction was only present for STIR images.
CI  - (c) RSNA, 2012.
FAU - Sutter, Reto
AU  - Sutter R
AD  - Department of Radiology, Orthopedic University Hospital Balgrist, Forchstrasse 
      340, 8008 Zurich, Switzerland. reto.sutter@balgrist.ch
FAU - Ulbrich, Erika J
AU  - Ulbrich EJ
FAU - Jellus, Vladimir
AU  - Jellus V
FAU - Nittka, Mathias
AU  - Nittka M
FAU - Pfirrmann, Christian W A
AU  - Pfirrmann CW
LA  - eng
PT  - Comparative Study
PT  - Journal Article
DEP - 20120824
PL  - United States
TA  - Radiology
JT  - Radiology
JID - 0401260
RN  - 0 (Metals)
SB  - IM
MH  - Adult
MH  - Aged
MH  - Aged, 80 and over
MH  - *Arthroplasty, Replacement, Hip
MH  - *Artifacts
MH  - Female
MH  - Humans
MH  - Image Enhancement/*methods
MH  - Magnetic Resonance Imaging/*methods
MH  - Male
MH  - Metals
MH  - Middle Aged
MH  - Prospective Studies
MH  - Statistics, Nonparametric
EDAT- 2012/08/28 06:00
MHDA- 2012/12/10 06:00
CRDT- 2012/08/28 06:00
PHST- 2012/08/28 06:00 [entrez]
PHST- 2012/08/28 06:00 [pubmed]
PHST- 2012/12/10 06:00 [medline]
AID - radiol.12112408 [pii]
AID - 10.1148/radiol.12112408 [doi]
PST - ppublish
SO  - Radiology. 2012 Oct;265(1):204-14. doi: 10.1148/radiol.12112408. Epub 2012 Aug 
      24.